Research in Motion, the company that makes the Blackberry, is going through a rough spot right now. But things must be pretty bad if Seesmic bailing. This is Seesmic, folks! They’ll build an app for any platform, evenWindows Phone 7.

The truth is that startups can only support so many mobile platforms. Other mobile developers might be feeling the same pressure to drop Blackberry or never create an app for it in the first place. Seesmic is definitely not alone in its assessment of the platform. Mobile Roadie recently concluded the same thing: the Blackberry is too hard to develop for and engagement is low.

What are Seesmic Blackberry users to do? On its blog, the company encourages “those effected by this change to try out Seesmic for Android, iOS and Windows Phone 7.” In other words, get a new phone.